Question

Account for the following:
a) Elements C , N, O and
F are placed in 2nd period of the periodic table
b) Elements of group 17 are monovalent.
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Answer 1

Answer:

SIS B) WALE KA YE ANSWER HE ↓

The elements of group 17 is monovalent because they require only 1 electron to be stable. ... Because the halogen elements have seven valence electrons, they only require one additional electron to form a full octet. This characteristic makes them more reactive than other non-metal groups.